body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}
input {
  border: 1px solid black;
  outline: none;
  background: transparent;
}

input:focus {
  outline: none;
}

.clearfix::after{
  content: ' ';
  display: block;
  clear: both;
  visibility: hidden;
  height: 0;
  font-size: 0;
}
.clearfix{
  zoom: 1
}
.fl {
  float: left;
}
.fr{
  float: right;
}
ul {
  padding: 0;
}
li {
  list-style: none;
}

.common-border {
  border: 1px solid #ddd;
  border-radius: 4px;
}